WO1995026865A1

WO1995026865A1 - Resin molding method and resin molding machine

Info

Publication number: WO1995026865A1
Application number: PCT/JP1995/000589
Authority: WO
Inventors: Masakazu Ohno; Chuzo Shimizu; Osamu Nakazawa; Sumio Sato; Yukio Yoshizawa
Original assignee: Sankyokasei Kabushiki Kaisha
Priority date: 1994-03-30
Filing date: 1995-03-29
Publication date: 1995-10-12
Also published as: EP0704292A4; EP0704292A1

Abstract

A resin molding method comprising a cleaning step comprising injecting a molten resin from a resin injection unit under such a condition that the matching portions of dies can be somewhat spaced from each other by loosening clamping of the dies to thereby permit the molten resin to flow into a cavity and a gap between the matching portions of the dies, and discharging a molding integrally formed by the cavity and the gap between the matching portions of the dies after the molten resin has solidified. Thus an attachment attached to the gap between the matching portions of the dies is mixed into moldings formed in the cleaning process, so that the attachment is discharged together with the moldings upon ejection of the moldings. Accordingly, cleaning can be positively and efficiently effected without expenses and without lowering an efficiency of the molding operation.

Description

Description Resin molding method and resin molding machine technology

The present invention relates to a resin molding method and a resin molding machine for feeding a molten resin into a cavity formed by a mold to form a molded product, and particularly to a mold for a resin. The present invention relates to a resin molding method and a resin molding machine for cleaning a resin. Background technology

There is a resin molding machine that sends a molten resin into a cavity formed by a mold to form a molded product. In such a resin molding machine, a mold is divided into a plurality of molds in order to take out a molded product. In addition, the butt of the dies is maintained by the fact that the dies have a considerably large clamping force. Also, the injected molten resin may enter the gaps between the butting parts (parting lines) of the molds and molds. Then, a compound generated by resin decomposition from the resin that has entered the gap between the butted portions of the molds has a strong force to adhere to the gap.

Also, depending on the type of mold, an air vent (chamber) is provided near the end of the cavity to remove gas. . A platform that uses such a mold, the air vent, and the butting parts between the air vent and the cavity In addition, it is easy for such deposits to adhere to the gaps between the molds. In addition, a hole is provided in the inner surface of the mold to form the cavity, and the projectile is inserted into this hole. There is a resin molding machine having a structure in which a mold is movably fitted, and a molded product is pushed out of the die by using the digibin to be separated from a mold. In this resin molding machine, when the molten resin is injected, the end face of the target bin is kept inside the cavity. It matches the surface. Then, the molten resin injected into the cavity enters the gap [^] between the agitator and the hole, and adheres to the inner surface of the hole.

In particular, in the case of using general-purpose resins, as well as resins that have recently been referred to as ultra-engineering plastics, molding is performed. Above, deposits easily adhere to the mold.

Such deposits must be removed because they can cause the mold to corrode or cause problems with unstable molding conditions. In the past, the task of removing this deposit was a very onerous task of opening the mold and cleaning the butted parts of the mold on a regular basis. Therefore, a simple method of removing the adhering matter is required.

The present invention is to remove the deposits in order to solve such problems caused by the deposits. Therefore, the deposits in the molding process are reduced by a simple method. It is an object of the present invention to provide a resin molding method and a resin molding machine that can be cleaned efficiently and efficiently. Disclosure of light

In the resin molding method of the present invention, a resin injection section for ejecting a molten resin and a plurality of dies are pierced at respective butted sections. The cavities formed by these molds by being fixed, the runner section connected to the resin injection section, the runner section, and the like. And connect to the cavity. Using a resin molding machine having a gate portion, the resin is melted from the resin injection portion into the self-cavity through the above-mentioned runner portion and the gate portion. After the resin is solidified and the resin is solidified, the fixing between the molds is released, the butted portions are separated from each other, and the molded article in the cavity is discharged. By loosening the fixing between the molds, the butted portions can be slightly separated from each other, and the resin melted from the resin injection portion can be removed. Inject and inject molten resin into the cavity and the gap between the butted parts of the molds Then, after the molten resin has solidified, a cleaning step of discharging a molded article formed integrally with the cavity and the gap between the butted portions is provided. . As a result, the adhering matter adhering to the gap between the projecting parts of the mold is mixed into the molded article formed in the cleaning process, and the molded article As a result, extraneous matter is discharged together with the molded product. With this method, this method can be used to simply loosen the fixing of the dies so that the butted portions can be slightly separated from each other. By performing injection molding, it is possible to reliably clean and remove deposits adhering to the gap between the parting lines, which is the gap between the butting portions of the molds. As a result, there is no need to perform cleaning work, such as opening the mold, as in the past. O A force that has been saved; Efficient cleaning can be achieved without deteriorating the molding efficiency.

Also, in the cleaning process, by loosening the fixing between the dies, the butted portions are made to be in a state where they can be slightly separated from each other. After the joining portions are slightly separated from each other, the molten resin is injected from the resin injection portion, and the molten resin is injected into the gap between the abutting portions of the cavity and the mold. Let it flow in. This ensures that the melted resin can enter the gap between the bumps.

In addition, in the process of cleaning H'J, the molds are loosened so that the butted portions can be separated from each other by a small distance. By injecting a larger amount of molten resin than the amount corresponding to the capacity of the cavity from the resin injection section, the molten resin flows into the cavity. When this is done, it is forced out of the cavity, and by the pressure, it is inserted into the gap between the butted butting parts of the mold. This eliminates the need to separate the butted parts of the mold.

In addition, the plurality of molds <-are fixed at the butted portions of the respective molds at the butted portions. An air escape portion to be formed is formed adjacent to the cavity. Then, in the cleaning step, the molten resin is injected from the resin injection section and the molten resin is injected. The molten resin is allowed to flow into the cavity between the cavity and the abutment portions of the mold, and the molten resin flows through the gap between the abutment portions of the mold. The molten resin also flows into the air vent. With this, it is possible to reliably clean and remove the adhered matter attached to the air vent portion.

The resin molding method of glj of the present invention is a method in which a molten resin is injected 9 o in a state where a resin injection portion and a plurality of dies are butted at respective butting portions. The cavities formed by the molds by being fixed, the runner section connected to the resin injection section, and the runner section. A resin molding machine having a gate portion connected to the cavity and from the resin injection portion through the front end portion and the gate portion. The molten resin is fed into the cavity, and after the resin is solidified, the fixing between the molds is released, and the butted portions are separated from each other, so that the keys are separated from each other. In the resin molding method that discharges the molded product in the cavity, the above-mentioned gate part is applied to one cavity. However, when the cavities are placed at positions opposite to each other, the runner section is branched to form a bifurcated bifurcation, and each bifurcation is formed. It is also possible to connect to the gate part and to switch the gate part into which the molten resin flows into the above-mentioned cavity each time the molding cycle is completed a predetermined number of times. by the Re Oh Ru ₀ this than Ri, if example embodiment, injected one gate one DOO part or al key ya bi Te I in the molten resin, after the molded article obtained by molding the discharge, when the next molding Pours molten resin into the cavity from the other gate part and discharges the molded product.o Therefore, the molten resin always flows in a certain direction in the cavity. The flow direction changes each time the used gate section is switched.o Therefore, the mold cap Etc. Te as I formation to that inner surface, etc. to deposit the adheres <<, be deposited Ru is in reliably removed because deposits the flow direction that will change o

In addition, at each branch of the branched runner section, a shutter pin for opening and closing each branch is provided, and the branch is performed at one of the shot pins. One of the sections is closed and closed, and molten resin is injected into the cavity from the gate section through the other open branch section. In this way, the gate section used Switching can be performed reliably ο

In still another resin molding method of the present invention, a resin injection part for injecting a molten resin and a plurality of dies are pierced at respective butting parts. The cavities formed by these dies by being fixed in the fitted state, and the plurality of dies are each provided with a protrusion. By being fixed in abutting condition at the set part, it is formed by these molds, and it is formed adjacent to the self-cavity. An air vent part for removing the air, a runner section connected to the resin injection section, and a caster connected to the runner section and the cavity. Using a resin molding machine having a gating part for a tee, the resin is discharged from the resin discharging part through the hot water part and the gate part for the cavities. The molten resin is fed into the cavity, and after the resin has solidified, the fixing of the molds is released, and the butted portions are separated from each other, and the keys are separated. The molded product in the cavity is discharged by a method, and the resin injection portion (contact; 15C) is provided in the air vent portion. A gate portion for the air vent portion is provided. In addition, by loosening the fixing between the molds, the butted portions can be slightly separated from each other, and the molten resin is injected from the resin injection portion. Then, the molten resin is allowed to flow from the above-mentioned gate for the air vent portion to the gap between the air vent portion and the abutting portion of the mold, and the molten resin is also discharged. The molten resin is caused to flow into the cavity through the gap between the protruding portions of the mold, and the molten resin is injected into the cavity. After the grease has solidified, a method is available to discharge the molded product formed integrally with the gap between the cavity and the butting part and the gab part. As a result, the molded product formed in the cleaning process is adhered to the gap between the abutment of the mold and the abutting portion of the mold. The adhering matter is mixed with the adhering matter, and the adhering matter is discharged together with the molded article when the molded article is discharged. Therefore, this method simply releases the fixing between the molds so that the butted portions can be slightly separated from each other, and then performs injection in the same manner as ordinary molding. Due to the molding, the adhering matter that adheres to the gap in the parting line, which is the gap between the butted parts of the mold, and the air adhered to the air vent. It is possible to clean and remove the adhered substances and There is no need to perform cleaning work, such as opening the molds one by one, as in the past. Therefore, the cleaning can be performed without any cost, and it can be reliably and efficiently cleaned without lowering the molding work efficiency.

Still another resin molding method of the present invention is that a resin ejection part for ejecting a molten resin and a plurality of dies are provided with a butt at each abutting part. The cavities formed by these molds by being fixed in the joined state, and the runner section to be connected to the resin ejection section And a gate portion connected to the runner portion and the cavity, and a cavity forming surface forming the cavity of the mold. Using a resin molding machine having a hole formed and a jack pin to be fitted in the hole, the end face of the jack pin is fixed to the mold of the mold. In a state in which it is aligned with the tee forming surface, the above-mentioned mold is formed from the above-mentioned resin ejection part via the above-mentioned runner part and the above-mentioned gate part. The molten resin is fed into the tee, and after the resin is solidified, the fixing between the molds is released, and the butt mounting members are separated from each other, so as to separate the dies. This is a method of ejecting a molded product in a cavity by protruding the ejector pin from the mold, and disposing the ejector pin on an end face thereof. The molten resin is ejected from the resin ejecting portion while the molten resin is ejected from the resin ejecting portion in a state where the molten resin is moved in the hole so as to sink from the cavity forming surface of the mold. The molten resin is allowed to flow into the tee and the hole, and after the molten resin is solidified, the above-mentioned jewel tapin is protruded to form a cavity and the hole. This is a method having a cleaning step of discharging a molded article integrally formed by the steps (a) and (b). As a result, the deposit adhered to the hole is mixed with the molded product formed in the cleaning process, and the deposited material is discharged by discharging the molded product. It is excreted with things. Therefore, this method simply moves the dielectric bin in the hole so that its end face sinks from the cavity forming surface of the mold. In this state, by performing injection molding in the same way as normal molding, the attached matter in the holes can be reliably cleaned and removed, and the molds are opened one by one as in the past. There is no need to perform cleaning work. With the applied force S, the cleaning can be performed without applying any cost, efficiently and surely without deteriorating the molding work efficiency. The resin molding machine according to the present invention is capable of injecting a molten resin into a mold to form a molded product, and at the same time, for molding a regular molded product, and for cleaning the mold. The molding machine main body that can be switched between the cleaning state and the molding state, and the molding conditions in the normal molding state are set as well. A normal molding condition setting section for outputting the set molding conditions; and a cleaning molding condition for outputting the set molding conditions as soon as the molding conditions in the cleaning state are set. A setting unit, a central processing unit that controls the molding machine main body based on the input molding conditions, Switching means for selectively connecting to one another, and Oh Ru. Thus, when the normal molding condition setting section and the central processing unit are connected by the switching means, the molding in the normal molding state set and output by the normal molding condition setting section is performed. The central processing unit controls the molding machine body under the conditions. Then, the molding machine body forms a regular molded product. On the other hand, if the cleaning molding condition setting unit and the central processing unit are connected by the switching means, the central processing unit will be in the molding condition in the cleaning molding state set and output by the cleaning molding condition setting unit. When the molding machine main body is controlled, the molding machine main body performs a regular molding according to the zero molding process for cleaning the molded article for cleaning the mold. Can be easily and quickly switched between the state where the mold is cleaned and the state where the mold is cleaned. Ο

Further, the switching means counts the number of moldings in the normal molding state in which the central processing unit is in contact with the regular molding condition setting unit, and further increases the counted number. The central processing unit is connected to the cleaning condition setting unit on a base that matches the preset number of times. As a result, the mold can be automatically cleaned every time the number of moldings reaches a predetermined number.

In addition, the central processing unit, when the cleaning molded article is molded by the molding machine body based on the molding conditions output from the cleaning molding condition setting unit, the molded article is cleaned and molded. Outputs a classification signal indicating that the product is a product. As a result, if the output of the classification signal is detected, it is possible to accurately remove the cleaning molded product. It becomes. Brief explanation of drawings

FIG. 1 is a schematic plan view of the first embodiment of the present invention, FIG. 2 is a schematic plan view of the first embodiment of the present invention at the time of molding for cleaning, and FIG. 3 is a plan view of the first embodiment of the present invention. FIG. 4 is a plan view of a cavity according to a second embodiment of the present invention, and FIG. 5 is a cross-sectional view of a runner portion of a mold according to a second embodiment of the present invention. Fig. 6 is a sectional view of a mold cavity of the second embodiment of the present invention, and Fig. 7 is a two-cavity type of the cavity of the third embodiment of the present invention. FIG. 8 is a cross-sectional view of a mold cavity of the third embodiment of the present invention, and FIG. 9 is a cross-sectional view of a cavity during normal molding of the fourth embodiment of the present invention. FIG. 10 is a cross-sectional view of a cavity at the time of cleaning and molding according to the fourth embodiment of the present invention, and FIG. 11 is a sectional view of the jack-bin and the cut-off of the fourth embodiment of the present invention. Perspective view of the replacement plate, FIG. 12 is a block diagram showing an injection molding machine according to a fifth embodiment of the present invention, and FIG. 13 is a mold clamping state in normal molding of the injection molding machine according to the fifth embodiment of the present invention. FIG. 14 is a front view showing the abutment surface of the mold after normal molding of the injection molding machine of the fifth embodiment of the present invention, and FIG. 15 is an injection diagram of the fifth embodiment of the present invention. FIG. 16 is a front view showing a mold clamping state in mold cleaning and molding of the molding machine. FIG. 16 shows a butt surface of the mold after mold cleaning and molding of the injection molding machine of the fifth embodiment of the present invention. FIG. 17 is a front view of the injection molding machine of the injection molding machine according to the fifth embodiment of the present invention, and FIG. 18 is a view showing the injection molding machine of the sixth embodiment of the present invention. FIG. 19 is a front view showing a mold clamping state in mold cleaning molding of an injection molding machine according to a sixth embodiment of the present invention. , 2 0 Ru Ah in the flowchart of injection molding machine of the sixth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, a resin molding machine will be described. The resin molding machine uses the molten resin The resin injection part 1 to be injected, a plurality of dies 50, 50, and the dies 50, 50 are joined. It has a mold clamping mechanism to fix it in the fitted state. The dies 50, 50 are fixed in such a manner that the butted portions 100, 100 are brought into contact with each other. The cavity 3 formed by 50, 50, the resin injection section 1 t and the welding TC 1 ¾5 road section 2, and the runner section 2 are connected to the cavity 3. And a gate section 5 to be connected to.

Then, the resin molding machine feeds the molten resin into the cavity 3 from the resin discharge section 1 through the runner section 2 and the gate section 5, After the resin has solidified, the molds 50 and 50 are released from each other, and the molds 50 and 50 are opened and joined from the parting line P cap. Parts 100, 100 are separated from each other, the cavity 3 is opened, and the molding process of discharging the molded product in the cavity 3 is repeated. Then, a certain number of molded articles 6 are molded and discharged one after another.

The runner part 2 is composed of one sprue part 2A connected to the resin injection part 1 and two runner parts 2 branched right and left from the spur part 2A. A cavity 3 is connected to each of the runner parts 2 B via gate parts 5. As a result, two molded articles 6 are formed by one molding. On the opposite side of the gate portion 5 of the cavity 3, the air-absorbing portions 100, 100 of the molds 50, 50 are provided through the air bearing portions 100, 100. The mounting part 9 is installed close to. In this resin molding machine, in a normal molding process, a predetermined amount of molten resin 4 which has been preliminarily measured is injected from a resin injection section 1, and a part 2 A, runner part 2 B, _Q injected into respective cavities 3 via gate part 5

At this time, the dies 50, 50 are held by the mold clamping mechanism with a predetermined pressure-resistant mold clamping force, so that the butting becomes a parting line P. Set part 1 0 0,

The resin 4 is not basically injected into the gap 7 between the 100's. In practice, the resin 4 is actually placed in the gap 7 between the butted portions 100 and 100. Slightly penetrates and adheres.

The gas generated in the cavity 3 escapes to the event section 9 via the gap 7 between the butting sections 100 and 100.

Holes 102 are formed in the cavity forming surface 101 forming the cavities 3 of the mold 50, and holes are formed in the holes 10 2. The connector pin 10 is fitted to the slide itself. This regular pin 10 is usually provided with the tip S [a 10a corresponding to the cavity forming surface 101 of the mold 50 at the time of regular injection molding. Position. Also, after the molten resin 4 in the cavity 3 is solidified, the mold 50 is opened from the partitioning line P and the cavity 3 is opened. In this state, when the ejector pin 10 protrudes from the mold 50; ^, the molded product 6 formed in the cavity 3 is removed from the mold 50; Drop off from Tee 3 and discharge o

The resin molding machine repeats such a molding process to form and discharge a fixed molded product 6 one after another. After performing the molding process a predetermined number of times or continuously performing the molding process for a predetermined time, the clamping force of the clamping mechanism is reduced or reduced. Release the clamping force of the clamping mechanism and loosen the dies. As a result, the molds 50 and 50 are in a state where the butted portions 100 and 100 can be slightly separated from each other. A slightly larger amount of the molten resin 4 having a large capacity is injected from the resin injection section 1 to the cavity 3 in the same manner as in normal molding. After the butting portions 100 and 100 are slightly separated from each other, the butting portions 100 and 100 are forcibly slightly separated from each other. Then, the molten resin 4 may be injected into the cavity 3 by the resin injection unit 1 as in normal molding.

'Mouth: ^: Specifically, the molten resin 4 overflows from the cavity 3, and the pressure of the molten resin 4 causes the butting portions 100, 50 of the dies 50, 50 to join. The molten resin 4 melts and deposits into the gap 7 between the nozzles 0 and 0 while actively and smoothly flowing into the mold 7. The molten resin 4 also dissolves the deposits in the air vent 9 through the gap 7 between the butted portions 100 and 100 of the air vent 9. Engulfed power

In this state, after the molten resin 4 has solidified, the mold 50 is opened with a parting line P. Then, by projecting the taper pin 10 from the mold 50 in the direction of the molded product 6, the jewel pin 10 is pulled out of the mold pin 10. Push off the molded product 6 in the box 3. Then, together with the molded article 6, the butt 1

The cleaning unnecessary molding portion 8 that spreads in a thin plate shape and is formed in the gap 7 between the 0 0 and 100 0 and the agent portion 9 is dropped as a body, and is dropped. Adhesives remaining on the gap 7 between the butted portions 100 and 100 and the air vent portion 9 are removed. The above is the cleaning process.

The adhering matter is heated by the molten resin 4 that enters the gap 7 between the butted portions 100 and 100 by such a cleaning process, and is also heated. The resin is removed by the fluid pressure, and the molten resin 4 is solidified, so that the solidified resin is taken into the solidified unnecessary molding for cleaning 8. In addition, the unnecessary molded article 8 for cleaning is discharged in a state where the molded article 8 is integrated with the molded article 6, so that the adhered substance is reliably removed from the parting line P. It is discharged and discharged, so that the deposits are surely removed.

Also, the flow of the molten resin 4 so that the deposits in the gap 7 between the butted portions 100 and 100 and the deposits on the inner wall of the cavity 3 can be removed more reliably. You can also change direction. In other words, the runner's part 2B, the gate part for inflow into the event part, which is branched from the 2B power, is connected to the air part part 9, and in the case of the aforementioned cleaning process, The molten resin 4 is caused to flow into the air vent 9 by the force of the gate for inflow of the air vent, and furthermore, the gap between the protrusions 100 and 100 is formed. It is also possible to inject the molten resin 4 into the cavity 3 via 7. In this case, since the molten resin 4 is injected into the beef cavity 3 from the direction opposite to the normal gate portion 5, the cleaning effect is further enhanced. .

Also, how often the above-mentioned cleaning molding is performed according to the type of resin used and the molding conditions, etc., and immediately, how many normal molding steps are performed After that, or usually, how many hours the molding process takes place is determined. Further, in this embodiment, the π-shaped resin push-back body 13 is used to remove unnecessary moldings 14 in the part 2 A of the spout of the runner section 2 in the direction of the resin injection section 1. The push-back push-back method is adopted.

This spray-less method involves injecting a molten resin 4 into a cavity 3, and after the molten resin 4 in the cavity 3 is solidified, pushes back the resin. The body 13 is pushed into the part 2 A of the sprue, and the unnecessary resin 14 in the part 2 ス of the sprue is pushed back to the resin injection part 1 and the part 2 It blocks A.

By adopting this spruce-less method, resin material is wasted because unnecessary molded products are not discharged in a part of the spur as in the past. There is no answer. As described above, so-called sprueless molding can be performed with an extremely simple configuration, and the practical value of the present invention is further enhanced.

In addition, if this spruce-less method is adopted, the resin injection unit can be used without using a mini-runner or an expensive hot runner system. Unnecessary moldings 14 in the runner section 2 can be pushed back into the resin injection section 1 by the resin push-back body 13 by the force that does not melt due to the heat of 1 It is melted in the resin injection section 1 in the state.

Also, since the molten resin 4 in the runner 2 (one part of the sprue) can be molded even when it is cooled and solidified, it is necessary to use a conventional nozzle and an injection nozzle as in the conventional case. do not do. For this reason, there is no resistance due to the nozzle portion when the molten resin 4 is ejected, and low pressure injection of the molten resin 4 becomes possible. As a result, the warpage and deformation of the molded article 6 can be reduced, and the variation in the quality of the molded article 6 in each molding step can be reduced.

In addition, the resin injection section 1 is closed by the resin push-back body 13. Therefore, even if the sprung part 2A of the sprue part 2 is large, it is possible to reliably prevent resin leakage from the sprue part 2A.

Hereinafter, a second embodiment of the present invention will be described below with reference to FIGS. In the resin molding machine of the second embodiment, a gate portion 5 into which molten resin 4 flows into one cavity 3 is connected at two places. 5 are provided at positions opposite to each other with the cavity 3 interposed therebetween. And the tree The runner section 2 connected to the fat injection section 1 is also branched into two branches, each of which is connected to each of the gate sections 5. The gate portions 5 are formed at positions facing each other so that the resins 4 flowing into the cavities 3 via the gate portions 5 flow in directions crossing each other. It has been done. A core 107 is arranged in the cavity 3.

A branch bin 11 is provided to shut off the tributaries of the runner 2 and the tributaries of the runner 2, respectively. Specifically, the left and right runner sections 2B, which branch right and left from the sprue part 2A force of the runner section 2 and guide the molten resin 4 to the left and right gate sections 5, are located in the middle of the left and right runner sections 2B. A shutter bin 11 that protrudes into the inner part 2B and that can be closed is provided. One of the runner sections 2B is shut off and closed by projecting the shutter pin 11 and the other runner section 2B is opened. The molten resin 4 is injected into the cavity 3 from the gate portion 5 through the runner part 2B.

For example, after the molten resin 4 is injected into the cavity 3 from one of the gate portions 5 and the molded product 6 is molded and discharged, the other gate portion is formed in the next molding step. The molten resin 4 is injected into the cavity 3 from the G part 5 and the molded product 6 is discharged.

Therefore, according to this method, the molten resin 4 does not always flow in a fixed direction in the cavity 3, and every time the gate portion 5 serving as an injection port is switched. Therefore, the flow direction changes.

For this reason, it is difficult for foreign matter to adhere to the walls of the cavity 3, etc., and even if it is attached, the flow direction changes in the direction crossing, so the foreign matter is removed and cleaned. O

Further, one of the gate portions 5 and the other of the gate portions 5 may be alternately used for each molding step, or may be used for a predetermined number of times by using one of the gate portions 5. After performing the molding process described above, it is also possible to switch to the other gate portion 5 and perform the molding process a predetermined number of times.

Also, if the molding conditions change when the other gate part 5 is used, resulting in a defective molded product, injection molding is performed from the other gate part 5. Place The molding is a molding process for cleaning, and the molding is performed a predetermined number of times by one of the gate portions 5 ¾ The switching to the other gate portion 5 is for cleaning only. Gorge

Conventionally, a gate portion is provided only at one location of such a cavity, and a molten resin is injected from the gate portion to be molded. As a result, the flow direction of the resin in the cavity is always almost constant, and the shadows are cast on the wall surface of the cavity and especially on the flow direction of the core. The formed workpiece (adhesion) is easily adhered to the side, and the molding conditions change due to the adhesion, so that a good molded article cannot be mass-produced. However, in this embodiment, Gate portions 5 are provided at opposing positions where the flow directions are opposite to each other, and the gate to be used is alternately switched to switch the injection position of the molten resin 4. In order to make it harder for deposits to adhere, remove and clean the deposits by switching the flow direction.

As in the present embodiment, the molding conditions are symmetrical and the molding conditions can be changed even if the molten resin 4 is injected from either one of the left and right gate portions 5 and 5 of the two gate portions 5. If it does not change, the gate section 5 may be switched for each molding process. However, for example, when one mold is thin and the other is a thick mold, the gate part 5 provided on the thick mold and the gate part provided on the thin mold are provided. The molding conditions are different between 5 and 5. Therefore, each time the gate part to be used is changed, the molding conditions must be changed correspondingly. Accordingly, for example, the molding conditions are set corresponding to the gate portion 5 of one mold, and the molding process using the gate portion 5 of the other mold involves molding the molded product 6. It may be a cleaning process.In this case, after a certain number of molding steps, the gate is switched and several times cleaning is performed. It is also possible to use a special molding for cleaning to perform

In the figure, reference numeral 104 denotes a ejector pin for discharging runners juxtaposed with the shot pin 11, and 10 denotes a molded product 6. 10 6 is a gate pin for cutting the gate section 5 • ≥r and closing the cavity 3. .

In the second embodiment, as in the first embodiment, a rod-shaped resin push-back body is used.

According to 13, the unnecessary moldings in the sprue part 2 A of the runner part 2 are injected into the resin ejection part 1 The sprue-less method of pushing back is adopted.

Hereinafter, a third embodiment of the present invention will be described below with reference to FIGS. In the resin molding machine of the third embodiment, the molds 50, 50 are fixed in a state where the molds 50, 50 are butted at the butting portions 100, 100, respectively. As a result, the air vent portion 9 formed by the molds 50 and 50 for air removal is placed next to the dry wall 3. In the third embodiment, an air vent section 9 is formed on the opposite side of the gate section 5 of the cavity 3, and this air vent section 9 is formed. The gate section 9 is provided with a gate section 109 for inflow to the event section which is connected to the runner section 2. In addition, a gate cut pin 106 that can close the gate portion 109 for inflow of the air vent portion is provided in the gate portion 109 for inflow of the air vent portion. At the time of normal injection molding, the injection molding is performed by closing the gate portion 109 for inflow of the air vent portion by the cut pin 106 of the gate portion. o The gate part input pin 106 is moved for each molding step or for each predetermined molding step, so that the gate part 10 for inflow of the air vent part is formed. 9 is opened, the molten resin 4 is injected from the gate part inflow gate part 109 into the air part part 9 and the cleaning process is performed.

As described above, the gate part for the inlet of the air vent section provided in the event section 9 after one molding step or after the molding step of a predetermined number of times is performed.ゝ Melt resin

Injecting 4 removes deposits in the air vent section 9, weakens the mold clamping force of the mold by the mold clamping mechanism, and reduces the butting section 100, By keeping the 100's slightly apart from each other, the pressure of the resin causes the abutment portions 100 and 100 to further abut from the air vent 9. The molten resin 4 flows into the cavity 3 through the gap, and the deposits attached to the gap between the struts 100 and 100 are removed. Before the resin injection, the butting portions 100 and 100 may be forcibly slightly separated from each other.

Hereinafter, a fourth embodiment of the present invention will be described below with reference to FIGS. 9 to 11. C The resin molding machine of the fourth embodiment forms the cavity 3 of the mold 50. Hole 102 formed in the surface 101 on which the dryness is formed, and the hole 102 is fitted into the hole 102. It has a common tap pin 10. At the time of regular injection molding, this ejector pin 10 has its tip surface 10a attached to the cavity forming surface of the mold 50.

The molded product 6 in the cavity 3 is discharged when it is located at the normal steady position corresponding to 101 and protrudes from the mold 50.

Immediately, as shown in FIG. 9, the tip pin 10 of the mold pin 10 is flush with the cavity forming face 101 of the mold 50. Fixed to the molding steady position. In this state, the normal molding process is repeated. Although omitted in FIG. 9, a molten resin 4 is injected into the cavity 3 from the same resin injection section 1 through the runner section 2 as in the first embodiment, and cooled and solidified. Let it go. After that, the three jewel pins 10 are protruded into the cavity 3, and the molded article 6 molded in the cavity 3 is released. Let it be discharged.

Such a normal molding process is repeated to form the molded product 6, but the repetition of such a normal molding process results in a hole 102 in the edge. Debris adheres to the clearance 111 for sliding the connector pin 10. For this reason, after each molding step or after a predetermined number of molding steps, the edge pin 10 is moved from its steady state position shown in FIG. After being moved in the hole 102 so that it sinks from the cavity forming surface 101 of the mold 50, it is melted from the resin injection section 1 in a fixed state. The melted resin is injected to cause the molten resin 4 to flow into the cavity 3 and the hole 102. Then, the molten resin 4 melts and deposits the attached matter. Then, the molten resin 4 is solidified, and the abnormally molded product 1 1 2 in which the resin is unnecessarily protruded only in the portion where the ejector pin 10 is submerged is formed. . Then, the abnormal tapping pin 10 is moved forward so as to protrude from the cavity forming surface 101 so that the abnormal molded product 112 is moved from the cavity 3. Let it be discharged. As a result, the deposits adhering to the clearance 111 on the cavity forming surface 101 side of the hole 102 are mixed into the molten resin 4 and solidified. Ri by the and the child that will be out high in, and this that will be the mold 5 0 force et al removal door ing ₀

In this molding, only the part where the Jugtabine 10 is submerged is resin The abnormal molded product 1 1 2 will be discharged. In the maintenance molding for molding this abnormal molded product 1 1 2, the cleaning and removing effect due to the flow of the high-temperature molten resin and the molten resin are solidified and extruded. The adhering matter is surely removed by the cleaning and removing effect by discharging.

In the present embodiment, each of the jewel plates 1 13 that move with the return pin 110 as a guide is connected to each of the jewel pins 1. 0 and project this plate 1 13 into the moving gap 1 14 large enough to allow it to move. By moving the actuator forward and backward with the drive rod 115, the movement control of the jewel pin 10 is performed.

In the present embodiment, a switching plate for switching and controlling the return position of the projecting plate 13 is provided on the projecting plate 13. O Rate 1 16 is set. O According to this switching plate 1 16, the ejector plate 1 13 is the most cabin 3 The position of the ejector pin 10 when it is moved to the initial position to be separated from it is switched between the steady molding position and the immersed position so as to be controlled and protected. It is configured in

In other words, in this embodiment, the switching plate is a switching plate with the plate 113.

A concave portion 1 18 and a convex portion 1 19 which can be combined with each other are formed. Then, the switching plate 1 16 is moved up and down by the switching drive source 120 so that it cannot be fitted into the convex portion 1 19 and the concave portion 1 18. Abut the switch plate 113 with the switch plate 113. Then, as shown in FIG. 9, the regulator pin 10 has a stationary position whose initial position coincides with the tip surface 10 a with the cavity forming surface 101. It is the molding position.

In the maintenance molding, the switching plate 13 is controlled to move so that the convex portion 119 and the concave portion 118 are fitted to each other. As shown in Fig. 10, it moves longer than the force of the pin 10 and the initial position of the pin 10 is the initial position of the pin 10a. It is set to the sunk position from the surface 1 0 1

Therefore, in this embodiment, the movement of the switching plate 1 16 is simply controlled. By itself, the initial position of the ejector pin 10 can be controlled, and therefore, the drive source 120, which simply controls the movement of the switching plate 116, is activated. The initial position of the digital pin 10 can be controlled with just a simple operation.

According to the present embodiment, the configuration is extremely simplified. For example, it is sufficient to control the movement of the ejector bin 10 by improving the existing mold structure, the operation is simple, and simply the ejector pin 2 is used. Deposits can be cleaned only by performing the normal molding process after performing operations to control movement.

Hereinafter, that explains a fifth embodiment of the present invention below with reference to FIGS. 1 2 to 2 0 ₀

The resin molding machine of the fifth embodiment is a toggle-type injection molding machine, and comprises an injection device 201, a mold device 202, a mold clamping device 203, and a control device 204. Be the subject.

The injection device 201 uses the screw cylinder 212 inserted in the heating cylinder 211 to eject it by using an injection cylinder 211 (FIG. 12). The resin is moved forward to the left to inject the resin in the heating cylinder 211 into the mold apparatus 202. The ejection cylinder 2 13 is provided with an ejection position sensor 2 14, and between the screw cylinder 21 and the ejection cylinder 21 3, A hydraulic motor (actuator) 2 15 for rotating the screw 2 12 in the circumferential direction is provided. The injection resin is measured by rotating the screw 2 12 by the hydraulic motor 2 15, while extruding the resin in the molten state to the tip side of the screw 2 12. Then, the screw 212 is retracted to the right in FIG. 12 by the resin pressure. The amount of resin to be measured can be obtained by detecting the retreat amount of the screw 2 12 by detecting it with the ejection position sensor 2 14.

The hydraulic circuit of the injection cylinder 2 13 is provided with a proportional pressure control valve 2 16 composed of an electromagnetic valve, a proportional flow control valve 2 17, and the like. The control of the injection pressure of the resin is performed by a pressure control valve 216, and the control of the injection speed is performed by a flow control valve 217. Note that the injection device 201 is self-moving to the left and right in FIG. 12 with respect to the mold device 202. Describing the mold apparatus 202, the fixed platen 220 has four fibers -221 (only two fibers are shown in the figure. One end of 3). Is fixed, and the other end of the timer 22 1 has a front plate 22 2 attached thereto. The screw part 2 21 a of the inverter 2 2 1 is screwed into the nut body 2 23, and the hydraulic motor (actuator) 2 24 The rotation of the nut body 22 moves in the axial direction of the timer 22 1.

In addition, a movable plate 25 is provided between the fixed plate 22 and the end plate 22. The movable plate 2 25 is movable right and left in FIG. 1 along the timer 2 21. The fixed plate 22 and the movable plate 22 have molds 22 and 22 respectively attached to them. The movable plate 2 25 is provided with a mold clamping position sensor 2 28, and the hydraulic motor 222 is provided with a mold thickness position sensor 2 29.

The mold clamping device 203 includes a mold clamping cylinder (actuator) 231, a toggle link mechanism 2332, and a force. The mold-closing cylinder 23 1 is attached to the end plate 22 2, and the toggle link mechanism 32 has one end connected to the end plate. 2 2 2, and the other r port J moving plate 2 2 5, respectively, and cross head 2 3 2 a with the mold clamp cylinder 2 3 1 screw It is connected to the tonrod 231, and is provided between the end plate 22 and the movable plate 22. The mold clamping device 203 moves the movable platen 222 toward the fixed platen 220 via the toggle link machine 1¾ ^ 32 2r by the extension operation of the mold clamping cylinder 231. Push and squeeze to clamp the molds 2 26 and 2 27 between the fixed platen 220 and the movable platen 22 7 o Molds 2 26 by the mold clamping device 203 , 227 are proportional to the elongation of the timer 221 at the time of clamping, so that the thickness of the mold is the same. The smaller the distance between the plates 2 2 becomes, the larger it becomes. The nut clamping force is adjusted by rotating the nut body 23 with the hydraulic motor 22. At this time, the mold thickness position sensor 222 detects the amount of rotation of the nut body 222, that is, the position of the end plate 222.

The control device 204 is connected to the central processing unit 241 and the central processing unit 241. Connected normal molding condition setting section 2 4 2, Mold cleaning molding condition setting section 2 4 3, Normal molding frequency force counter (switching method) 2 4 4, Mold cleaning molding frequency counter 2 4 5, a mold thickness retreat amount setting section 24 6 for mold cleaning molding, an input circuit 2 47, and an output circuit 2 48 are provided. Sensors 21, 22, 22 9 are connected to the input circuit 2447, and the D / A converter 24 24 is connected to the central processing unit 24 1.

The pressure control valve 2 16 and the flow control valve 2 17 are connected via 9 and an amplifier 250. In addition, the output circuit 248 includes actuating circuits 2 1 3 and 2 1

Solenoid valves etc. provided in the hydraulic circuit such as 5, 2, 24, 231, etc. are connected o

The normal molding condition setting section 242 is used to set the injection conditions A (A is the normal molding condition and mold cleaning molding described later) for injection pressure, speed, etc. in molding a regular molded product. It is distinguished for convenience from condition B.), resin weighing value A, cooling time A, mold clamper A, etc. are set. Also, mold cleaning molding condition setting section 2 4

3 sets the injection condition B, the measured value B, the cooling time B, the mold opening stop position B, etc., when cleaning the molds 2 26 and 2 27. It is.

Mold cleaning molding condition B for normal molding condition A is usually set as follows, but depending on the platform, some of them may be the reverse of the following. .

Injection pressure of injection condition: A ≥ B

Injection speed of injection condition: A ≤ B

Weighing value: A ≤ B

Cooling time: A ≥ B

The normal molding number counter 244 indicates the number of moldings of the regular molded product, and the mold cleaning molding number.The power counter 245 indicates the number of cleaning moldings of the molds 226 and 227. Each is set. Also, the mold thickness retreat amount setting section 2446 during the mold cleaning molding is shown in FIG. 12 of the end plate 22 when the molds 22 26 and 2227 are molded by cleaning. It sets the amount of retreat to the left in the above.

The amount of retreat is not generally determined by the type of resin, the injection (filling) pressure, the structure of the mold, or the like. 6, There is a gap g (Fig. 15) of 0.2 to 3 mm, preferably 0.5 to 2 'mm between the butting surfaces 2 2 6 f and 2 2 7 f of 2 2 7 It is done. The central processing unit 241 has a function of outputting a separation signal for separating the cleaning molded product molded under the mold cleaning molding conditions.

The central processing unit 24 1 of the control device 204 includes the setting contents set in the setting units 24 2, 24 3, 24 46 and the counters 24 44, 24 45, and the center. Control the actuators 21, 21, 22, 24, and 31, and output the force that was used as the output signal of the sensor 214, 228, 229. Although molding is performed, the actual control will be described based on the flow chart in FIG. In addition, the basic structure of the ejection device 201, the mold device 202, and the mold clamping device 203, the mold cleaning molding condition setting section 243, and the force counter 2444, 2 All of the basic structures of the control device 204 except the reference numeral 45 and the mold thickness receding amount setting portion 246 during the mold cleaning molding are known.

When the operation is started, normal regular molding is performed under the molding conditions set in the ordinary molding condition setting section 242 (step S1). That is, when the injection is performed under the injection condition A (step S2), the normal molding number counter 2444 is counted (step S3). It is determined whether the set number of times has been reached (step S4). If the set number of times has not been reached, the base is weighed with the weighing value A (step S5), cooled by the cooling time A in step S6, and then opened. (Step S7), and the molded product is ejected to the mold opening completion position (Step S8), and the weighing values A and B are determined in Step S9. If the value is A, the process returns to step S1.

As shown in Fig. 13, the mold base for normal molding is such that the dies 22 6 and 22 7 are attached to each other with the protruding surfaces 2 26 f and 2 27 f without any gaps. The mold is clamped. For this reason, as shown in FIG. 14, the injection device 201 passes through the sprue part a, the runner part b, and the gate part d to the cavity C as shown in FIG. The injected resin 200 does not enter a large amount into the abutting surfaces 22 6 f and 22 7 f of the molds 22 6 and 22 7, so that a normal molded product M can be obtained. . The symbol e is an air vent provided for removing gas from the cavity C, and the resin 2 is also provided on this air vent. 0 0 force; never enter.

If the set number of times has been reached in step S4, the weighing value Β · is measured (step S10). If the weight value is Β in step S9, the process proceeds to the next step S11, where the mold thickness retreats, that is, the end plate 22 is formed. Only the set value of the thickness retraction amount setting part 2 46 can be retreated to the left in Fig. 12. By retreating the end plate 222, when the injection is completed after the mold hoof, the butt surfaces 2226f and 2227f of the molds 2226 and 2227 There is a small gap g between them.

Next, the normal molding counter 244 is reset (step S12), and the mold cleaning molding is performed (step S13). That is, when the injection is performed under the ejection condition B (step S14), the mold cleaning molding number counter 2445 counts (step S15). ), It is determined whether or not the set number of times has been reached (step S16).

If the set number of times has not been reached, the sample is weighed with the weighing value B (Step S17), cooled by the cooling time B in Step S18, and then opened. (Step S 19), and when a defective (separated) signal is output from the central processing unit 24 1, the value is changed to fc (Step S 20), and the mold is opened. The cleaning molded product is protruded at the position (step S21). The weighing values A and B are determined in step S22, and if the weighing value is B, the process returns to step S13.

In the case of mold cleaning molding, as shown in Fig. 15, when the injection is completed after the mold is clamped, the butting surfaces of the molds 22 6 and 22 7 abut each other. There is a gap g between f. The injection force was emitted from the injection device 201 through the sprue part a, the runner part b, and the gate part d to the cavity C. As shown in FIG. 5, a large amount of the resin 200 penetrates into the abutment surfaces 222 f and 222 f of the molds 222 and 222.

At this time, the small amount of resin adhered to the abutment surfaces 2 26 f and 2 27 f of the mold during normal molding is reduced to the abutment surfaces 2 26 f and 2 27 f Is heated by the large amount of molten resin that has entered the unit and becomes integral with it, thus cleaning it. The molds 222 and 222 are removed together with the molded article Ma.

Since the cleaning molded article a is defective, it must be separated from the ordinary molded article M. The failure signal of step S20 is output to, for example, a classification robot (not shown) to activate it. In the embodiment shown in the figure, the normal molded product M and the cleaning molded product Ma are protruded from the mold at different positions of the mold opening (the former is the mold opening completed position, and the latter is the mold opening halfway position). Because it is issued, it will not be mixed even by itself

If the set number of times is reached in step S16, the weighing is performed with the weighing value A (if the weighing value is A in step S23 or step S22). Then, the process proceeds to the next step S24, in which the end plate 222 moves forward and returns to the normal molding position. The power is reset (step S25), and the operation moves to step S1.

FIG. 18 to FIG. 20 show another embodiment of the present invention. The injection molding machine of this embodiment is a direct pressure type injection molding machine, and the mold clamping device 203 is composed of a large hydraulic cylinder (actuator) 252. The hydraulic cylinder 25 2 is provided with a mold clamping sensor 25 3. Except for the injection unit 201 and the mold plate 202 end plate 222, the structures of the fixed platen 220 and the movable platen 222 are the same as those of the injection molding machine shown in Fig. 1. Is

In addition, the control device 204 removes the mold thickness retreat amount setting section 246 during the mold cleaning molding from FIG. 1 and also provides the mold cleaning molding condition setting section 243 with the mold clamping. Mosquito B is added. The mold clamping sensor 253 is connected to the input circuit 247 and the mold clamping force is set to A> B. In this case, the size of the mold clamper B cannot be said unconditionally. However, when the injection is completed, the same range as described above is provided between the butt surfaces 22 6 f and 2 27 mm. The gap g is set to a large value.

FIG. 20 shows a flow chart of this injection molding machine. As is clear from comparison with the flowchart of FIG. 17, steps S 1 a and S 13 a are shown in the flowchart of FIG. 17. S11 and S24 are omitted. To explain this, in step S1a, the mold clamping force is the mold clamping force A under the normal molding conditions. Then, in step S13a, the mold clamping force under the mold cleaning molding conditions is used. If the weight value is “Β” in step S 9, the process immediately proceeds to step S 12, and if the weight value is A in step S 22, the process proceeds immediately. Proceed to step S25.

In the injection molding machine of this embodiment, the main difference between the normal molding and the mold cleaning molding is that the clamping force is large or small. Otherwise, there is no apparent distinction (see Figs. 18 and 19).

In the present invention, one or both of the counters 244 and 245 are omitted, and normal molding and mold cleaning are performed by operating a push button or the like. It can be configured to switch between moldings. Switching between normal molding and mold cleaning molding can be performed by another signal, for example, a signal for switching a resin production lot. Further, the present invention can be implemented in an electric injection molding machine. Industrial applicability

As described above, the resin molding method and the resin molding machine according to the present invention can be performed by a simple method without having to open a mold and perform a cleaning operation each time as in the related art. Deposits in the molding process can be efficiently cleaned with low cost. In other words, it does not require any cost, is surely efficient, and is suitable for cleaning without deteriorating the molding work efficiency.

Claims

The scope of the claims

(1) The resin injection part that injects the molten resin and the multiple dies are fixed in a state where they are butted at each butting part. A cavity formed by these molds, a runner section connected to the resin injection section, the runner section and the cavity. Using a resin molding machine having a gate section connected to the

The molten resin is fed into the cavity from the resin injection section via the runner section and the gate section, and after the resin is solidified, the mold is formed. In the resin molding method of releasing the fixed parts, separating the butted parts, and discharging the molded product in the cavity,

By loosening the fixation of the molds, the butted portions are slightly separated from each other, and the molten resin is injected from the resin injection portion to release the cows. The molten resin is allowed to flow into the gap between the butt and the projecting portion of the mold, and after the molten resin has solidified, the cavity and the gap between the butted portions are joined together. A resin molding method characterized by having a cleaning step of discharging a molded article integrally.

(2) In the cleaning step, the fixing of the molds is loosened so that the butted portions can be slightly separated from each other, and then they are butted. After the parts are slightly separated from each other, the molten resin is injected from the resin injection part, and the molten resin flows into the gap between the abutting parts of the cavity and the mold. The resin molding method according to claim 1, wherein the resin molding is performed.

(3) In the cleaning step, the fixing of the dies is loosened so that the butted portions can be slightly separated from each other, thereby reducing the volume of the cavity. By injecting a larger amount of molten resin than the corresponding amount from the resin injection section, the molten resin is allowed to flow into the cavity and to be cast. 2. The resin molding method according to claim 1, wherein the resin is caused to overflow from the cavity and to enter the gap between the butted portions of the mold by the pressure. .

(4) The plurality of dies are formed by being fixed in such a manner that the dies are abutted at the respective abutting portions. An air vent part for air escape is formed adjacent to the cavity, and in the cleaning process, from the resin injection part. The molten resin is injected to allow the molten resin to flow into the gap between the cavity and the abutting portion of the mold, and to cause the abutting portion of the mold to abut the molten resin. The resin molding method according to any one of claims 1 to 3, wherein the molten resin is caused to flow also into the air vent portion through a gap.

(5) A resin injection section for injecting the molten resin, and a plurality of molds that are fixed in a state where they are protruded from the respective protruding parts. A cavity formed by these molds, a runner section connected to the resin injection section, the runner section and the cavity. Using a resin molding machine that has a gate section that contacts the

The molten resin is fed into the cavity from the resin ejection section via the runner section and the gate section, and after the resin has solidified, In the resin molding method, the fixing between the molds is released, the butted portions are separated from each other, and the molded product in the cavity is discharged.

In one cavity, the gate portion is provided at two places, at positions opposite to each other with the cavity interposed therebetween, and the runner portion is branched. Then, two branch portions are formed, and each branch portion is connected to each gate portion. Each time a predetermined number of molding cycles are completed, molten resin is contained in the cavity. A resin molding method characterized by switching a gate portion into which a resin flows.

(6) At each of the branched sections of the runner section, there is provided a shutter pin for opening and closing each of the branched sections, and one of the shutter bins is provided. 6. The method according to claim 5, wherein one of the branches is closed and closed, and the molten resin is injected into the cavity from the gate through the other open branch. The resin molding method described.

(7) A resin injection section for injecting the molten resin and a plurality of molds 2 7

The cavities formed by these dies by being fixed in the butted state at the butted portions, and the plurality of the cavities. The dies are fixed at the butted portions of the respective butted portions, so that the cavities are fixed to the cavities by these dies. An air vent for air removal formed on the adjacent base; a runner to be connected to the resin injection section; and a runner for this runner and a front i-cab. Using a resin molding machine that has a gate section for cavities connected to the tee

The molten resin is fed into the cavity from the resin discharge section through the runner section and the cavity gate section, and the resin is solidified. After that, in the resin molding method, the fixing between the molds is released, the butted portions are separated from each other, and the molded product in the cavity is discharged.

In the above-mentioned abundance part, a gabion part gate part to be connected to the resin injection part is provided,

By loosening the fixing of the molds, the butted portions are slightly separated from each other, and the molten resin is ejected from the resin injection portion to discharge the molten resin. The molten resin is allowed to flow from the gate for the air vent into the gap between the abutment of the air vent and the butted portion of the mold. The molten resin is caused to flow into the cavity through the gap between the joining portions, and after the molten resin is solidified, the gap between the cavity and the abutment portion is formed. A resin molding method characterized by having a cleaning process for discharging a molded article integrally formed with an air vent portion.

(8) The resin injection part for injecting the molten resin and the multiple dies are fixed in a state where they are butted at each butting part. A cavity formed by these molds, a runner section connected to the resin injection section, a runner section and the cavity. A gate portion to be connected, a hole formed in the cavity forming surface forming the cavity of the mold, and a gage fitted in the hole. Using a resin molding machine with

Align the end face of the taper pin with the cavity forming surface of the mold. In this state, the molten resin was fed into the cavity from the resin ejection section through the runner section and the gate section, and the resin was solidified. Thereafter, the fixing of the dies is released, the butted portions are separated from each other, and the dielectric pin is made to protrude from the dies to form the cavity in the cavity. In the resin molding method that discharges products,

The edge pin is melted from the resin injection portion while being moved in the hole so that its end face is sunk from the cavity forming surface of the mold. The molten resin is injected to cause the molten resin to flow into the cavity and the hole, and after the molten resin has solidified, the dielectric pin is projected. And a cleaning step of discharging a molded product formed integrally with the cavity and the hole portion.

(9) The molten resin is injected into the mold to form the molded product, and the regular molded product is molded, and the cleaning molding is performed to clean the mold. A molding machine body that can be switched between a cleaning state and a molding state.

A normal molding condition setting unit that outputs the set molding conditions when the molding conditions in the normal molding state are set;

A cleaning molding condition setting unit for outputting the molding conditions set when the molding conditions in the cleaning state are set; and

A central processing unit that controls the molding machine main body based on the inputted molding conditions;

Switching means for selectively connecting the central processing unit to one of the regular molding condition setting unit and the cleaning condition setting unit; and

A resin molding machine characterized by having:

(10) The switching means counts the number of times the central processing unit performs molding in the normal molding state connected to the regular molding condition setting section, and further increases the counted number. 10. The injection molding machine according to claim 9, wherein the central processing unit is connected to a cleaning condition setting unit when the number of times matches a preset number. (11) The central processing unit, when the cleaning molded article is ^ -shaped by the molding machine main body based on the molding conditions output from the cleaning molding condition setting section, the one that has been ^ -shaped. The injection molding machine according to claim 9 or 10, wherein a separation signal indicating that the product is a cleaning molded product is output. .